“Language is such a play,” Julia Holter chirrups on “Silhouette,” a meditation on a dude that blooms into a Bjork-ian fractal of voices, strings and harpsichord shards. All the world’s indeed a stage on this enchanting fifth LP, the latest in the California singer-composer’s evolution from avant-electronic vocal explorer towards a lush semi-pop middle-ground that’s theatrical, liturgical and shoe-gazing. Holter’s English-language flow rides non-English cadences without suggesting mimicry, just as she blurs acoustic and digital tone-colors. See the title track finale, informed as much by Gregorian chant as doo-wop. “Oh yeah, I second that emotion,” she purrs, quoting Smokey Robinson as if from outer space, a slyly angelic voice spanning centuries.